I have inherited an iPhone 6S from a family member and the phone needs a new battery. The reason it needs a new battery is that it doesn't hold a charge even when the phone is shut off. It loses 20% battery charge every 12 hours. I am planning to go to local Apple store in the next few days and ask them to replace the battery. I have spoken with Apple Customer Service and was told that it would cost $80 to replace the battery. My question is. Has anyone had a battery replaced for free in an iPhone that's around 2 years old?? I don't mind too much paying $80 but, it would be nice if it was replaced for free. Thanks in advance.